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To identify the duplicates on key column

Hi,

I have to compare the current record key column value with previous record key column value in same tale (comparison on same column). If duplicate found, i have to concatinate other column values.

Exp:

Input:

Id(key), Code
1, A
1, B

Output:

Id, Code
1, A|B

Please help me on this requirement.

Regards,
Mallikarjuna P

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